Saw-gummer.



C. A. CHANDLER.

SAW GUMMER. APPLICATION FILED MAR. 17, 1909.

Patented Feb. 8,191.0.

srarns SAW-GUMMER.

Specification of Letters Patent.

Application filed March 17, 1909.

Patented Feb. 8, 1910. Serial No. 483,930.

To all whom it may concern:

Be it known that I,-OLARENOE A. GHAN- DLER, of East Bridgewater, in thecounty of Plymouth and State of Massachusetts, have invented certain newand useful Improvements in Saw-Gummers, of which the fol lowing is aspecification.

This invention relates to the type of saw gummer set forth in LettersPatent of the United States, No. 540,145, granted to me May 28, 1895,said machine comprising a movable holder, a spindle journaled in theholder and movable longitudinally, and a disk file mounted on thespindle and rotatable therewith, the file being free to playlongitudinally, and to tilt on the spindle to a limited extent, theorganization of the ma chine, as a whole, being such that the rotaryfile which is continuously rotated at a high speed, is successivelyadvanced into the throats between the teeth of a circular saw, such asthat employed in a cotton gin, the file rising as it advances so as tocompensate for a slow rotary motion imparted to the saw, and thendropping back over the tooth forming one side of the throat last formedor gummed, to position for entrance into the next throat.

The present invention relates entirely to the loose rotative engagementbetween the disk file and the spindle whereby the file is adapted toplay longitudinally on the spindle and tilt thereon to a limited extentfor the purposes stated in the above mentioned patent.

The invention has for its object to enable the disk file, while looselyengaged with the spindle and free to move sidewise and to tilt thereon,to be so engaged therewith that it is delicately poised on the spindle,and is adapted to be rotated by the spindle at a uniform rate, andwithout a spasmodic or jerky motion.

The invention consists in the improvements which I will now proceed todescribe and claim.

Of the accompanying drawings, forming a part of thisspecification,Figure 1 represents an end view of a file-driving spindleconstructed in accordance with my invention. Fig. 2 represents a sectionon line 22 of Fig. 1. Fig. 3 represents a side view of a disk fileadapted for use with the spindle shown in Figs. 1 and 2. Fig. 4:represents a section on line H of Fig. 3. Fig. 5 represents a side viewshowing the spindle and a tions l6, l8, and 19 plurality of disk filesengaged therewith. Fig. 6 represents a perspective View of a removableterminal member of the spindle.

The same reference characters indicate the same parts in all thefigures.

I have represented in the drawings only a portion of the file-drivingspindle and the disk file carried and driven thereby, the said spindleand file being adapted for use as parts of an organized machine of thetype shown in the above mentioned Letters Patent.

11 represents the body of the spindle which may be supported and drivenby means such as those shown in the said patent, and 12 represents adisk file adapted to be loosely engaged with the spindle in such manneras to have a limited freedom of sidewise movement in a directionlengthwise of the spindle, and a limited freedom to tilt or rocksidewise 011 its own center. The acting' portion of the file is abeveled face 13 having suitable file teeth out thereon.

In carrying out my invention, I provide as the part of the spindle whichengages the file a removable terminal member which is preferably of theform and construction represented in Fig. 6, said member beingoriginally a metal spindle section which is circular at all parts incross section, and includes a reduced inner end portion 16 which isexternally screw threaded to engage an internally threaded socket 17 inthe body portion 11, a portion 18 of larger diameter adjoining thereduced portion 16, and a still larger portion 19 adjoining the portion18. As originally formed, the porof the terminal member have continuouscylindrical peripheries.

The terminal member is afterward pro vided with longitudinal grooves 20which convert each of the portions 16, 1S, and 19 into a plurality ofwings, as indicated clearly in Fig. 6. The terminal member thus formedis screwed into the socket 17 in the end of the spindle body 11. Thewings of the portion 18 constitute gear teeth radiating from the centerof the terminal member, the inner ends of said teeth forming shouldersabutting against the outer end of the spindle body 11, which is ofgreater diameter than the gear toothed portion 18. The portion 19 of theterminal member is of larger diameter than the portion 18 so that thewings formed by the grooves 20 project outwardly from the gear teeth,and constitute shoulders opposed to the shoulders formed by the outerend of the body portion 11.

The disk file 12 is provided with a central orifice 14, the wall ofwhich has recesses 15 so formed that the said wall constitutes in effectan internal gear adapted to engage the gear teeth provided by theportion 18 of the terminal member. The said internal gear is so formedthat it is adapted to loosely engage the gear teeth on the terminalmember, so that the file is free to tilt to a limited extenton theterminal member, the thickness of the central portion of the file beingsuch that it has a limited play between the shoul ders formed by the endof the body of the spindle and the enlarged portion 19 of the terminalmember.

I have found in practice that by providing the spindle with a pluralityof radiating gear teeth substantially as here shown, and the disk filewith a plurality of internal gear teeth, I am enabled to reduce the sizeof the central aperture in the disk file and the cross section of thetoothed portion of the spindle which occupies said orifice, to theminimum, so that the following advantageous results are secured: First,the fulcrum on which the file tilts or tips is brought close to the axisof rotation of the file, so that the file is delicately balanced, and isfree to tilt in either direction without a preponderance of weight ateither side of its center of oscillation. This makes the margin of thefile sensitive, and enables it to easily conform to the points of theteeth which it encounters without liability of injury to such points.Secondly, the size of the central orifice in the file is reduced to theminimum, so that the file has the maximum strength and rigidity at itscentral portion.

I prefer to provide the file with a series of projections 22 surroundingthe central orifice 14, and projecting from the under side of the file,said projectionsoccupying the angles between the recesses 15 andconstituting fulcrums located in close proximity to the center of thefile, and adapted to bear on the confining shoulders formed by theportion 19 of the terminal member. The fulcrum projections 22 arelocated in the closest possible proximity to the center of the file 12,so that they contribute to the delicate balancing of the file which Ihave above mentioned.

In Fig. 5, I have shown a plurality of disk files 12 arranged on thesame spindle,

two being shown in this case. The outer file is confined on a geartoothed port-ion 23 of the terminal member by a'thumb nut 2a whichconstitutes a shoulder at the outer end of the teeth of the portion 23,and is engaged with a reduced threaded outer end portion 25 of theterminal member. The outer file is of smaller diameter than the innerfile, and the arrangement of the files is such that thetwo are adaptedto simultaneously enter two interdental spaces of a saw 26,-the relativearrangement of the spindle, files, and saw being as shown in Fig. 5.

I claim:

1. In a saw-gummer, a file-driving spindle having aremovable terminalmember located in axial alinement with the spindle and provided with agear toothed portion, shoulders being provided at the opposite ends ofthe toothed portion, and a disk file having a central orifice the wallof which is formed as an internal gear adapted to loosely engage thesaid toothed portion, the file being loosely confined between saidshoulders and adapted to tilt on the terminal member.

2. In a saw-gummer, a file-driving spindle having a removable terminalmember located in axial alinement with the spindle and provided with aplurality of gear toothed portions, shoulders being provided at theopposite ends of each toothed portion, and a plurality of disk fileseach loosely confined between two of said shoulders and having a centralorifice the wall of which is formed as an internal gear adapted toloosely engage one of the toothed portions of the terminal member, theouter file being of smaller diameter than the inner, whereby the filesare adapted to simultaneously engage a saw.

3.In a saw-gummer, a file-driving spindle having file-confiningshoulders and gear teeth between the same, and a disk file having acentral orifice the wall of which is formed as an internal gear adaptedto loosely engage said gear teeth, one side of the disk having a seriesof projections surrounding the orifice and bearing on one of saidshoulders.

In testimony whereof I have atfixed my signature, in presence of twowitnesses.-

CLARENCE A. CHANDLER.

Vitnesses C. F. BROWN, P. WV. PEZZETTI.

